OCR Text |
Show transmitting energy longer distances, the hazards of thermal and nuclear pollution, conflicts with preservation of natural or scenic areas, and other environmental factors. Consideration will need to be given to the use of dry-type cooling in lieu of water cooling. The magnitude of increased electric power production needed will require close attention to design requirements for air and water pollution control measures. Principal transmission lines to be required in year 2000 and year 2020 are shown on maps following page 104. ALTERNATIVE PROGRAM CONSIDERATIONS Water Conservation and Reclamation Many alternative means of conservation and reclamation of the Region's water supplies were considered during the course of the studies and those that appeared reasonable were incorporated into the program. Major alternatives considered are as follows: 1, Increased irrigation efficiency-Provision was made for the rehabilitation of existing conveyance systems to reduce seep- age and other losses. Improved irrigation practices would increase onfarm efficiencies from the present 60 percent average to 75 percent by 2020. Soil conditions and leaching requirements would limit efficiencies to about the 75 percent projected. 2, Water reclamation and reuse-The regional water supply utilized in the framework program assumes reuse of all water. Provisions for the reclamation of water through treatment and/or recharge to underground reservoirs are included in the program. 3, Phreatophyte removal and control-The removal and control of some riparian vegetation are included in the program for the annual salvage of 300,000 acre-feet of water and for channel maintenance. Wildlife considerations materially limited the extent of this salvage program. h. Increased water yield-Vegetative management practices are included in the program to increase annual runoff by 180,000 acre-feet by 2020. . Wildlife considerations also limited the extent of this program, 5, Reservoir evaporation suppression-The effectiveness of and benefits to be derived through evaporation reduction measures is the subject of considerable controversy. Further research is needed before this program can be evaluated. 103 |